Solutions by everydaycalculation.com
1st number: 1 1/3, 2nd number: 15/21
43 + 1521 is 4321.
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Related: 8/3+15/21 4/3+30/21 4/6+15/21 4/3+15/42 12/3+15/21 4/3+45/21 4/9+15/21 4/3+15/63 20/3+15/21 4/3+75/21 4/15+15/21 28/3+15/21 4/21+15/21
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